k-omiga model?

June 12, 2004, 10:25

who can give the wall BC of k-omiga model? k=0, omiga=?

June 12, 2004, 12:52

The best way to set omega is to use the surface roughness model developed by Wilcox (see for example his great book Turbukence Modeling for CFD). Even if you want a smooth wall it is still good to use the surface roughness model but set a hydralically smooth surface. This is more stable than most other omega bc's. If you haven't got Wilcox' book you should get it. In the mean time I think that you can find the surface roughness model briefly described in one of the papers I wrote as a PhD student (see my homepage: http://www.cfd-online.com/Users/jola/ ).

June 14, 2004, 09:13

hi. you can use below bc for k-w mdel ( form menter paper) at inlet:w=5*Vin/L at free stream: w=1--10)V/L where V=10**(2--5) at wall: w=60*nu/(b*dy**2)- b=0.75

June 14, 2004, 10:52

what is nu?

June 14, 2004, 20:01

Read Appendix of the following paper. Medic and Durbin, 'Toward Improved Prediction of Heat Transfer on Turbine Blades' Transactions of ASME, Journal of Turbomachinery, Vol. 124, pp. 187-192, 2002.

Good Luck

June 26, 2004, 07:00

nu is kinematic vicousity

June 12, 2004, 10:25	k-omiga model?	#1
lsm Guest Posts: n/a	who can give the wall BC of k-omiga model? k=0, omiga=?

June 12, 2004, 12:52	Re: k-omiga model?	#2
Jonas Larsson Guest Posts: n/a	The best way to set omega is to use the surface roughness model developed by Wilcox (see for example his great book Turbukence Modeling for CFD). Even if you want a smooth wall it is still good to use the surface roughness model but set a hydralically smooth surface. This is more stable than most other omega bc's. If you haven't got Wilcox' book you should get it. In the mean time I think that you can find the surface roughness model briefly described in one of the papers I wrote as a PhD student (see my homepage: http://www.cfd-online.com/Users/jola/ ).

June 14, 2004, 09:13	Re: k-omiga model?	#3
javadi Guest Posts: n/a	hi. you can use below bc for k-w mdel ( form menter paper) at inlet:w=5Vin/L at free stream: w=1--10)V/L where V=10(2--5) at wall: w=60nu/(bdy*2)- b=0.75

June 14, 2004, 10:52	Re: k-omiga model?	#4
lsm Guest Posts: n/a	what is nu?

June 14, 2004, 20:01	Re: k-omiga model?	#5
Halim Choi Guest Posts: n/a	Read Appendix of the following paper. Medic and Durbin, 'Toward Improved Prediction of Heat Transfer on Turbine Blades' Transactions of ASME, Journal of Turbomachinery, Vol. 124, pp. 187-192, 2002. Good Luck

June 26, 2004, 07:00	Re: k-omiga model?	#6
javadi Guest Posts: n/a	nu is kinematic vicousity

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